Reviewing the XML, the XML fully loads (</Project> tag is displayed at end of project). The project may not be found in the prdocument table if it hasn't been saved back successfully before. After first time opening it where it hangs, you will see the following message generate prior to it hanging.
"The last time you opened 'ProjectID' it caused a serious error" when attempting to open a project from Clarity may also be seen (See KB: MSP Error: "The last time you opened 'ProjectID' it caused a serious error..." for more details on this error)
Release : 15.5.1
Component : CLARITY MICROSOFT PROJECT (MSP)
If the above doesn't help, please contact Broadcom support for assistance
Workaround: Delete the most recent baseline in Clarity