Archicad must be able to communicate with BIMcloud / BIMcloud Basic to provide Teamwork. To verify this, run the Network Diagnostic Tool from the Open / Join dialog or the Teamwork Palette. Verify whether all necessary ports are open and the server machine is available from the client machine.
Snapshots are created during working hours
Creating library / project Snapshots is a fairly intensive I/O process of BIMcloud / BIMcloud Basic. Schedule these Snapshots to be created after working hours.
3rd party applications are blocking the communication on the server side
Antiviruses, firewalls, backup or any other monitoring applications (e.g. Windows Search, macOS Spotlight) tend to scan all files in real time, which can cause huge performance issues on the server side. Turn off file indexing and add the Projects and Attachments folders to the exception list in your antivirus / firewall settings.
3rd party applications are blocking the communication on the client side
Similar to the server side, monitoring apps can interrupt the communication between Archicad and BIMcloud / BIMcloud Basic. In the settings of the above-listed applications, add Archicad and its folders to the exception list. Make sure to schedule 3rd party backups to run outside of working hours.
Forward proxy is installed
Make sure to add the BIMcloud / BIMcloud Basic address(es) to the bypass list.
Teamwork project is corrupted
It is possible that due to a power outage or an OS update, a particular project's database becomes corrupted. In this case the easiest way to fix the issue is to restore one of your latest Snapshot files (.BIMProject, .PLN or .archive) from the web interface of the BIMcloud Manager.
Network infrastructure issue
Software and hardware issues in the network infrastructure can cause trouble as well. Make sure the driver of the Network Interface Card is up-to-date. Verify the hardware side: check network cabling and test the performance of the Network Interface Card with copying a large file to the server computer through the network. If you still experience the above issue, please contact your GRAPHISOFT support representative. For the investigation Archicad FastLogger files and BIMcloud log files might be necessary.