Progress bar stuck after pasting text with embedded comment

Hi,
I am experiencing a problem with what I presume is a progress bar for identifying if Scrivener has fully rendered a page. I moved text containing a comment to a new document and when I returned to the previous one, the progress bar was stuck on 37%.

Closing and reopening Scrivener had no effect. It was still there at 37%. Scrivener used to behave like this, but has generally not recently, except now, apparently as a reaction to moving the commented text. I have searched the support forum, but since I am not sure of the language used for this progress bar have failed to find an answer.

Running Scrivener for Windows 1.5.3.0.on 32 bit Windows Vista.

Any assistance appreciated especially since I am not sure of the significance of this error for saving documents.