(2018-04-03, 13:43)Max Martin Richter Wrote: I'm not sure, but I thought LDView is only downloading parts from the server, if the requested part couldn't be found in any ldraw folder.
I hope you divided your libraries in an official and unofficial part. So you just need to delete the files, which needs to be reloaded, in the unofficial folder.
LDView by default won't check for a part more often than once every 7 days, both for missing parts and updated parts. What this means is that if it looks for a missing part and doesn't find it, it won't look again for that part for 7 days. Similarly, if it downloads a part from the parts tracker, it won't check to see if that part has updated on the parts tracker for 7 days. (And if it checks for an update and doesn't find an update, it similarly waits for 7 days before checking again.)
You can set these values to a minimum of 1 day on the "Updates" tab of LDView's preferences. Also, in Windows, you can force LDView to forget when it last checked by using regedit.exe to delete the HKEY_CURRENT_USER\Software\Travis Cobbs\LDView\UnofficialPartChecks registry key. Note that these checks don't in fact track the LDraw directory you use, so if you switch back and forth between multiple LDraw directories, you can confuse it.
I think I'll add a button to have it forget download times for all parts. Furthermore, I might have it do that automatically if you manually change the LDraw directory.