Refx Nexus 4 suddenly crashes GigPerformer

What shall I do?

Yesterday my Gigfile crashes every time, I have uploaded the crash report in this thread. I loaded an empty Gigfile and loaded Nexus 4 - the Gigfile crahes and Nexus 4 says, that it has crashed my DAW and wants me to send a report.

Today I want to reinstall Nexus 4 but there was an update (Vers. 4.5.4 to 4.5.5). Yesterday there was no update. I updated Nexus 4 and my normal Gigfile with 6 Rackspaces, that use Nexus 4, works. I tried every rackspace and had no issue.