Unable to create subdomain or domain on the subscription, Plesk Panel hangs stating 'PLEASE WAIT'.
It is not getting completed and it keeps on loading.
websrvmng.exe process lists and check permissions recursively for the subscription where domain\subdomain is created. If there is a big amount of folders and files in the subscriptions content it can take a lot of time to complete this checking.
This is a default Plesk behavior. Unnecessary folders and files can be removed in order to speed-up this process.
The issue was reported to developers to improve the performance of subscription creation in future.