The first step towards troubleshooting the client issue is to gather the relevant system details and confirm if it matches the hardware and OS specific recommended by Collaaj.
To gather system details type in Start -> Run -> msinfo32
Group and User Privileges
The next steps are to gather the privileges associated with the user in terms of group permissions, policies and related details
Gather Group Details for Logged in User
To gather the group details for the logged on user type: Start -> Run -> lusrmgr.msc
Gather User Specific Details
For user specific details from command prompt type: user <windows username>
Collaaj Client Related Checks
Once you have the machine and user specific details run the Collaaj client under following configurations to eliminate the user privileges being an issue.
Unblock installer/tool downloaded from internet
Download the Collaaj client. Unblock the installer (if blocked) and then install it. If the user has Collaaj client installed, please ask to uninstall first. Then run the Collaaj client. If the client does not run, please proceed to the next step (running client as Admin).
Run Collaaj client as Admin
Multiple Monitors and DPI
The next step is to determine whether the user has a single monitor setup or multiple monitor set up. Windows 8/8.1 further introduced the concept of independent DPI for each monitor.
To gather the details of the set up, please navigate to "Control Panel -> Display":
Navigating to Display will show the DPI (measured in percentage) values:
If "Let me choose one scaling level for all my displays" (available only on Windows 8/8.1) is checked, it indicates uniform DPI (say 150%) for all monitors. If it is not checked, it indicates that each monitor has its own DPI setting. For instance, the first monitor might have a DPI setting of 100% and the second monitor might have a setting of 150%.