Not sure if anyone is still following this thread, but here goes … The text filter alpha channel bug - reversion to 255 - has been in Shotcut pretty much all the time I’ve been using it seriously, which is since August 2018.
I’m referring to the background only; never had a problem with the font.
The weird thing is, it isn’t consistent. I use the text filter a lot, and the reversion to 255 happens in only a small number of cases - mostly when I’ve used a large number of characters in multiple rows, and when I’ve gone back to edit the text filter. I’ve actually seen the number for the background (I tend to use 230) change back to 255 after I’ve OK’d an edit.
Shotcut is a great program, and this is a pretty minor issue. But if a fix is possible, I’d be really grateful.
I should add that I run Shotcut in Windows 10, and that I update it regularly (version 19-01-27 as of right now).