Hi,
There was an update on the Merge Network very recently which broke importing and the HUD for the Merge Network. We did not have any notice in advance about this change but we're already looking into the issue and hope to have a fix in beta as soon as possible. We will inform you once we have any updates ready.
If you want to be notified when it is fixed please send an email to support@holdemmanager.com and include "Notify Me When HM-8427 Is Resolved" in the subject line and body of the email.