Sale Manger Error: Unable to process the command

[ArrBoo]

What is this? Cant find and search for items in the Sale Manager? I always get this error even if i restart Rohan?

I already tried:
Log Out - Log In
Start Internet Explorer in Background
Start Rohan as Admin
Restart PC

What I have noticed:
If you restart the PC, the first search in the Sale Manager works. The first page gets loaded. But if you click on the second page to view more items it says "Server not responding" and after the "Unable to process the command" and the Bug starts again.

My System Specs:
Windows 7 and the old Internet Explorer. The other specs arent nessasary.

ROHAN FIX THIS