STRUCTURE problem. Patches disappearing

[Chris7514]

Hi Everyone !
I am noticing a bizzare and very unwelcome problem while working with Structure. The patches are disappearing from Database, after loading them, and I can not find them again, no matter how thoroughly I search through the Browser. That applies to both igidesign and East West Goliath. I have all licenses etc. The last Structure instance was particularly bizzare. For no reason all of the sudden ALL patches and programs dissappeared from database !!! i didn't do anything odd, didn't change a thing for that matter. Did anyone experience similar problem ? What's the reason ? After I re-instated the plug-in the patches are there, but the ones that I loaded and they dissapeared from the Database bin, are nowhere to be found ! It looks like they simply dissapear from the HD.
PT 7.3.1
Mbox, MacBook Pro 2.16 GHz, 2 GB RAM, LaCie 250 GB external HD for audio, G-Tech 250 GB HD for patches. MIDI express.