I've had the same slowness/hanging issues with PSI (1.5) the past day or so... maybe their servers aren't responding?  

I've also noted that PSI is not finding IE on several of my systems...

Thanks for the confirmation.

I finally got through to the Secunia forum, and see that others are complaining also. Obviously a server problem:
http://secunia.com/community/forum/thread/show/14462/secunia_psi_gray_icon_and_locked_in_loading

(I had an APC surge protector die on me today, which shut down all my PCs, monitors etc. Thought it might be related, but twas just a co-incidence).