@dex_luther Thanks for the feedback. Would have been better to start a new topic for this, but we'll go with this for now 😉
As of 2.3.0 a darkmode for Windows has been implemented (as mentioned on the RMTV page, I just added the Windows 10 version comment, to make it more complete based on this post) - since the widgetset for win32 does not support dark mode, a semi-fake dark mode had to be fabricated which does use certain API calls. However, it would have been good to report the exact Windows version. I've seen with one other user that older Windows 10 version are not quite doing things right, as certain API calls do not exists or work differently under the older Windows 10 version.
Note that on the preferences screen, at the bottom, you have a "disable darkmode" option for Windows users, so when dark mode doesn't work properly, light mode can be enforced.
Next, TVDB often fail to appear; Do you have examples that work with the old version but doesn't show with the new version? I don't think anything changed with the clean-up filter, but then again: it's been quite a long time that I have been working on and off on RMTV.
Not remembering that cleanup should be on or off: Please keep in mind that the setting in the main window is often only intended for a quick change while working on your files. To make it permanent, you'd have to change the setting in Preferences. (under the "Show and Episode Info" tab)
The information box at the bottom left is misaligned; Can't reproduce this under Windows or macOS? What version are you using?
Titles not in English: When doing a search with the new TVDB API (v4, where as the old one uses v2 which has been marked as deprecated for quite a while now) only the Japanese title appears. This is probably why the cleanup filter removes these entries as an English title was not returned. I may be overlooking something here of course, so I'll try to make some time this week to see if I can find something in the documentation (takes a bit of time). I've added this to my "To Do" list 😊