Yes I recommend trying an earlier version as there seems to be several issues with 1.5.5
For the record Vital 1.5.5 works on two system here in FL Studio 21 but I am using Windows 10 not 11 so that may be a clue.
It could possibly be a graphics issue since you say Vital will play on a track but clicking on the interface causes crashes.
Let me know 
It appears that it is a graphics issue. I tried it in safe mode and it worked then tried low resolution video mode and it also worked on that. I still don’t understand why my previous version doesn’t work properly or know what to do now.
I have just tried v 1.5.1. Same.
What graphics adapter or card do you have? Even on this system which has ancient Intel onboard graphics, Vital 1.5.5 will work and on my studio system it works fine with a GTX 1050ti.
Intel(R)HD Graphics 4600 I just went back to my old PC on W7 and it worked fine. It was FL 12 however.
My internet system has Intel HD Graphics 2500 so Vital should work on your system.
I could be wrong but I seem to remember seeing other people reporting issues that were also running Win 11 but don’t quote me on that as my memory may be failing me.
Did you say the Standalone won’t work on your Win 11 system either? If not that would tend to point away from it being FL Studio as the cause.
Did you try posting at the FL Studio forums just to see what they say?
Are you using the VST 2 or VST 3 version of Vital? I recommend using the VST 2 version in FL Studio at least.
The standalone does not work unless I use safe mode or low-resolution video mode.
Also, I am using VST 2.
I will post something on the FL Studio forum.
This is very interesting . I have just opened Audacity and it says " Incompatible plugin"
C:\Program Files\Steinberg\VSTPlugins\Vital.dll
Have you tried (re)installing 1.0.8 ? was that the version you were using before it all went wrong ?
I was using v 1.0.7. Yes, I have tried that and I get the same problem.
Ok I’ve responded to your post at the Image-Line forums.
When you go to the FL Plugin Manager and look for Vital, is the path shown in the PM the place where the Vital.dll is located ?
Yes it is. Also, I think that I have just confirmed that it is a graphics problem.
While looking for possible solutions, I had another plugin loaded and was looking at VST wrapper settings.
When I tried to load Vital for the umpteenth time it opened where the other one was closed i.e VST wrapper settings.
It was OK until I switched to plugin editor and then it crashed.
I have just noticed that briefly before it crashed, as seen in the image, everything is there except the Vital graphics.
Where are the graphics files stored and in what format are they?
Vital uses vector graphics. There are no graphics files stored outside of the .dll
There are .vitaltheme files that contain the settings for custom themes. You could try removing any of those from Documents/Vital.
Did you try the steps I posted at the FL Studio forums? I think your Vital installation has been corrupted somehow.
I can’t find any .vitaltheme files anywhere on my hard drive.
I am a bit confused with going back and forth between the two forums but I seem to have done everything anyone has suggested.
Do you mean the installation file has been corrupted? Perhaps I will download it again.
I have downloaded a new copy of the installation file.
It suggests the following folders
Select your VST plugin directory> C:\Program Files\Steinberg\VstPlugins
Is that OK?
It is in my plugin search paths.
I intend to install VST only
I seem to remember in previous installations I was asked for two directories but just one this time.
I haven’t installed it yet. I will wait for a reply.
Also, I disabled my AV before the download.
I have just realised something. When starting the install (which I have abandoned for now) it remembered my preferences i.e. only installing the VST version.
Where does it get that info from?
I personally wouldn’t install my VST plugins inside the Program Files folder but you can leave it like that if you have FL Studio pointed to scan that location.
No I don’t think the installation file itself was corrupted but it didn’t hurt to download a fresh one. I think it’s more likely that going from an old version to a new version then back to an old version again might have left some config files out of sync like these perhaps:
At any rate if you delete all the Vital files (make sure to back up your preset files and I would even try moving the entire Vital folder out of Documents and let it install a fresh one. You can move the preset files back after you get it working again) then do a fresh install of the last version that was working for you then technically there should be no reason it wouldn’t work again. It worked on your system before so the same version should work again. Whether or not the latest version 1.5.5 will work is another question.
Just make sure that after you install Vital again to do a full plugin re-scan in FL Studio using the settings I posted on the IL forums.
Latest update. I disabled my graphics driver and all is well. I haven’t come across any issues with graphics so far 
