There is a bug report on Launchpad that describes exactly what is happening to me.
How do I add myself to this bug report as it is currently marked as "undecided" importance with no-one assigned to it. It is quite a pain not being able to read the menus.
I am worried that making my own bug report would simply cause it to be marked as a duplicate.
I read How do I report a bug? and also https://help.ubuntu.com/community/ReportingBugs. The "how do I report a bug" link doesn't seem to clearly state what to do if you have the same bug. The ReportingBugs page seems to suggest not adding "me too!" to a bug report.
(Edit)
It has been suggested that this is a duplicate of How do I subscribe to a bug?. My intent was to indicate that the bug affected me also, not to merely subscribe to it and get notifications. The reason was that I wanted the developers to know that the bug affected more than one person.
The answer by pomsky was helpful because it described how to indicate that the bug affected me as well.
This had the desirable side-effect of generating this message on the bug report:
Status changed to 'Confirmed' because the bug affects multiple users.