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I'm afraid I have no idea, plugins work in mysterious ways. I have the opposite problem, i.e. qt5ct doesn't work with the regular xnviewmp package.

I changed apps style from QtCurve to Breeze and now it works. What can be wrong with QtCurve?

Alright that looks like a classic style plugin issue. Can you try to unset any style-related environment variable like QT_QPA_PLATFORMTHEME and see if it helps?

@Corax I just run it from command line:

redneck@pylesos ~> xnviewmp
MDK 0.15.0 (git e8c668a) - Multimedia Development Kit. Copyright (c) 2016-2022 WangBin(QtAV author) <wbsecg1 at gmail.com>
Build for: Linux x86_64; Clang14.0.6 GCC4.2.1; libc++14000; 15:26:29 Aug 23 2022
free(): invalid pointer
fish: Job 1, 'xnviewmp' terminated by signal SIGABRT (Abort)

journalctl contains this:

                                                    #25 0x00007fb2a0b68ef3 _dl_catch_error (libc.so.6 + 0x14fef3)
                                                    #26 0x00007fb2a0a9b4af n/a (libc.so.6 + 0x824af)
                                                    #27 0x00007fb2a0a9ba91 dlopen (libc.so.6 + 0x82a91)
                                                    #28 0x00007fb2a0e87233 n/a (libQt5Core.so.5 + 0x287233)
                                                    #29 0x00007fb2a0e87bf3 n/a (libQt5Core.so.5 + 0x287bf3)
                                                    #30 0x00007fb2a0e87e10 n/a (libQt5Core.so.5 + 0x287e10)
                                                    #31 0x00007fb2a0e7ffad _ZNK14QFactoryLoader8instanceEi (libQt5Core.so.5 + 0x27ffad)
                                                    #32 0x00007fb2a1de7613 _ZN13QStyleFactory6createERK7QString (libQt5Widgets.so.5 + 0x1e7613)
                                                    #33 0x00007fb2a1d75a32 _ZN12QApplication5styleEv (libQt5Widgets.so.5 + 0x175a32)
                                                    #34 0x00007fb2a1d75bf6 _ZN19QApplicationPrivate10initializeEv (libQt5Widgets.so.5 + 0x175bf>
                                                    #35 0x00007fb2a1d75ea7 _ZN19QApplicationPrivate4initEv (libQt5Widgets.so.5 + 0x175ea7)
                                                    #36 0x0000000000875f81 n/a (XnView + 0x475f81)
                                                    #37 0x0000000000966fe3 n/a (XnView + 0x566fe3)
                                                    #38 0x00000000004b3b4a n/a (XnView + 0xb3b4a)
                                                    #39 0x00007fb2a0a3c290 n/a (libc.so.6 + 0x23290)
                                                    #40 0x00007fb2a0a3c34a __libc_start_main (libc.so.6 + 0x2334a)
                                                    #41 0x00000000004b42cf n/a (XnView + 0xb42cf)

                                                    Stack trace of thread 22762:
                                                    #0  0x00007fb2a0a9c4b6 n/a (libc.so.6 + 0x834b6)
                                                    #1  0x00007fb2a0a9ecd0 pthread_cond_wait (libc.so.6 + 0x85cd0)
                                                    #2  0x00007fb2a0ceb744 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 +>
                                                    #3  0x00007fb2989dac24 n/a (libQt5WaylandClient.so.5 + 0x72c24)
                                                    #4  0x00007fb2a0ce42ba n/a (libQt5Core.so.5 + 0xe42ba)
                                                    #5  0x00007fb2a0a9f8fd n/a (libc.so.6 + 0x868fd)
                                                    #6  0x00007fb2a0b21a60 n/a (libc.so.6 + 0x108a60)

                                                    Stack trace of thread 22763:
                                                    #0  0x00007fb2a0b140bf __poll (libc.so.6 + 0xfb0bf)
                                                    #1  0x00007fb2989dac7d n/a (libQt5WaylandClient.so.5 + 0x72c7d)
                                                    #2  0x00007fb2a0ce42ba n/a (libQt5Core.so.5 + 0xe42ba)
                                                    #3  0x00007fb2a0a9f8fd n/a (libc.so.6 + 0x868fd)
                                                    #4  0x00007fb2a0b21a60 n/a (libc.so.6 + 0x108a60)

                                                    Stack trace of thread 22761:
                                                    #0  0x00007fb2a0b140bf __poll (libc.so.6 + 0xfb0bf)
                                                    #1  0x00007fb29cb6ee2f n/a (libglib-2.0.so.0 + 0xabe2f)
                                                    #2  0x00007fb29cb170d2 g_main_context_iteration (libglib-2.0.so.0 + 0x540d2)
                                                    #3  0x00007fb2a0ed750c _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17Proc>
                                                    #4  0x00007fb2a0e8532c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so>
                                                    #5  0x00007fb2a0ce749f _ZN7QThread4execEv (libQt5Core.so.5 + 0xe749f)
                                                    #6  0x00007fb2985a3cba n/a (libQt5DBus.so.5 + 0x23cba)
                                                    #7  0x00007fb2a0ce42ba n/a (libQt5Core.so.5 + 0xe42ba)
                                                    #8  0x00007fb2a0a9f8fd n/a (libc.so.6 + 0x868fd)
                                                    #9  0x00007fb2a0b21a60 n/a (libc.so.6 + 0x108a60)
                                                    ELF object binary architecture: AMD x86-64

Uh, not great. I didn't encounter any problem when I played with 1.3.1 a bit on Sunday. Was that triggered by doing something in particular? If you haven't tweaked things, you should see a backtrace from systemd-coredump in journalctl.

free(): invalid pointer
fish: Job 1, 'xnviewmp' terminated by signal SIGABRT (Abort)

xnviewmp package doesn't have such error.

@jouven: interesting, I have no idea what could really cause this but glad that using the system libs is solving that problem too :D

Just to comment I was using https://aur.archlinux.org/packages/xnviewmp and the enter key wasn't working, see https://forum.xnview.com/viewtopic.php?f=82&t=43910&sid=fbc591f605849443c1d7d6d5c0ca60db but with this one it works.

@jrichard326: no problem, happy to help / clarify things :)

@Corax: thanks. I am still learning here. Your maintenance of this package is very much appreciated.