The fact that it only crashes when managing certain games rules out a lot of the common reasons.
One thing you could check: Please go to settings to enable advanced mode, then go to the extensions page and disable the following extensions:
- Gamebryo BA2 support
- Gamebryo BSA Support
- Gamebryo Plugin Management
- Gamebryo Savegame Management
- Mod Dependency Manager
Then let it restart and see if the white screen is now "fixed".
If so, please reenable the plugins one-by-one and see at which point the crashes start again.
If I'm reading your report right, you're saying this only happens since 0.17.1, not in earlier versions? Then the most likely cause is the savegame management extension.
Out of curiosity: How many savegames do you have for the games that crash?
Please also make sure that you report the issue via the "More" button in the error notification.
Ok, disabling those extensions has removed the whiting, after restarting gamebryo plugin indexlock is aronge and says 'failed'.
Just enabled ba2 plugin and still ok.
Just enabled bsa support and still ok.
Just enabled plugin management and still ok.
Just enabled savegame management and all appeared ok, until I selected the save games panel for FO4, (edit: now it goes white even on a different panel). I managed to select witcher3 and then FO3, everything ok except when I selected the savegame panel in FO3 I get a continuous 'loading' message on a blank panel.
The two games that suffer from the white ui have more than one profile, whereas FO3 and SKSE just have the one 'default' profile. Also each profile for FO4 and FONV has the option selected for its own savegames, whereas FO3 and SKSE do not have this selected in their single profile each.
I would test by changing FO3 to select this option but I'm little worried what might go wrong at this time:)
Managed to switch to FO3 to submit report, but when i opted to attach recent state changes (was going to attach all special files) vortex froze! 
Disabled savegame management and enabled mod dependency extension, all good so far,
Reenabled savegame management et voila! the white ui is back.
At this time the white ui does not seem to revert to the normal ui, I have to restart to get a chance to switch games to FO3 or SKSE or witcher3.
Yes this only happens with 17.1
I managed to get a feedback sentoff by restarting and not choosing to attach state changes file.
I altered the FO3 profile to have its own savegames and imported (moved) them from global. This went ok, I then cloned the profile and copied the savegames, still ok except for continuous loading of the savegames panel.
I tried selecting a different profile for each of FO4 and FONV and at the moment FONV doesn't go white bit I also get the blank savegames panel just saying 'loading'. FO4 however, goes white no matter what.
I have an early shift tomorrow so i will check back after:)
Edit: today FONV whited out after booting win and starting vortex