Yes, you are right. It's described here: Stream Deck mini suddenly blank - #7 by bcarp
When I upgraded to BTT 5.294 & 5.296, I lost ability to use my Stream Decks. I then rolled back to 5.179 in order to have my Stream Decks working. I've been using 5.179 until the problem earlier today.
There are so many files in that folder. Which ones can I safely remove? Here's my list of current files in ~/Library/Application Support/BetterTouchTool/
bettertouchtool.bttlicense
btt_data_store.v2
btt_data_store.v2-shm
btt_data_store.v2-wal
btt_data_store.v3
btt_data_store.v3-shm
btt_data_store.v3-wal
btt_data_store.version_5_179_build_2025021101
btt_data_store.version_5_179_build_2025021101-shm
btt_data_store.version_5_179_build_2025021101-wal
btt_data_store.version_5_199_build_2025021219
btt_data_store.version_5_199_build_2025021219-shm
btt_data_store.version_5_199_build_2025021219-wal
btt_data_store.version_5_294_build_2025033105
btt_data_store.version_5_294_build_2025033105-shm
btt_data_store.version_5_294_build_2025033105-wal
btt_data_store.version_5_296_build_2025040101
btt_data_store.version_5_296_build_2025040101-shm
btt_data_store.version_5_296_build_2025040101-wal
btt_user_variables.plist
BTTClipboardManager_20241210.sqlite
BTTClipboardManager_20241210.sqlite-shm
BTTClipboardManager_20241210.sqlite-wal
bttdata2
BTTStreamDeckPreview (folder)
Files (folder)
floating_menu_variables.plist
Logs (folder)
NotchBar (folder)
PresetBundles (folder)
urlimported.bttlicense