Create a text document; Insert->Media->Audio or Video; select some MP3 file. Back in the document, select the newly created media icon, and look at automatically appearing Media Playback toolbar (appears at the bottom). In Writer 5.3, it contained functional playback controls and the media name. Starting with 5.4, the panel only has one button ("Insert Audio or Video"), which is disabled. One only can control the playback using sidebar's Properties panel. The same steps in Calc produce normal Media Playback toolbar.
Created attachment 181693 [details] Toolbar in Writer and Calc Can't see a difference between Writer and Calc. Attacment shows toolbar in Writer Version: 7.3.5.2 (x64) / LibreOffice Community Build ID: 184fe81b8c8c30d8b5082578aee2fed2ea847c01 CPU threads: 4; OS: Windows 10.0 Build 19044; UI render: Skia/Raster; VCL: win Locale: de-DE (de_DE); UI: en-GB Calc: CL
Not reproduced. Mike: I assume you were using Windows. Do you still see this? Version: 7.6.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: df470d9658c202a990b9c75e2a8d6e3fd7a06dfd CPU threads: 2; OS: Windows 10.0 Build 22621; UI render: Skia/Raster; VCL: win Locale: en-US (en_FI); UI: en-US Calc: threaded
Hmm... Maybe it's a matter of window size? I see now the "chevron" button on the right-hand side of the toolbar, and indeed under it, the whole rest of the panel appears; increasing the size of the Writer window finally makes it all instantly fit and appear - so it looks like a huge single control, that would not fit until the window is as wide as to fit all the controls plus the *potentially long file name*. I'd say, it's still a (minor) bug, with long file names it may easily seem non-functional.
Bibisected the change with linux-64-5.3 repo to https://git.libreoffice.org/core/commit/6228d6c52e4a6e6c0d82632a135211286e06852e tdf#32581 Add the possibility to retrieve the filename of media