Bit difficult to create a support package when not able to open/join the project...
Been having this problem with multiple projects since thursday. Moved the most problematic projects (errors in multiple files, HLM, ...) to a second BIMserver. No more errors were reported on the second server.
Did one test with a single, small project with same issue on server 1. Moved to server 2 - opened swiftly, without remarks.
Cleaned it up a bit and moved back to server 1 (original location): same error...
Remarkably: the file was half the size once we moved it to server 2...
I suspect server installation of server 1 went bad...