ISTA+ Document not working

[andyB2018]

Hi, I have ISTA+ 4.39.20 and I try to look for a SSP for E87, when I click on the link A23b (Driver's switch cluster) and then Document (bottom lef corner), I get this error, basically I can't see the full module schematic (full rectangular shape of ECU instead of dotted line - partial schematic, it's not an ECU but you guys get the ideea). 

   

What can I do?

   

[TheNine90]

Sometimes that happens. I see it most of the times when the there is no further references docs

[andyB2018]

I was thinking that my ISTA is missing some files but apparently I'm not the only one with this issue.