Since a recent update, it seems that analog lab 4's presets are being corrupted by Analog Lab 5 or by an update pushed out by Arturia Software Center.
When I browse favorite presets in Analog Lab 4, I see about 50% stuff that won't load.
Either 
1.  incompatible presets shouldn't be shown in analog lab 4 (and probably should be in different folders and with different file extensions).
-or-
2.  The design here has gone wrong.
-or-
3.  There are bugs.