It can be error in Velocity Macro, which renders this dropdown. Possible, vm rely to wrong velocity parameter (like instead of "$filterName" it should use "$filterNameNew"). Velocity renders it as empty string with error in log (usually). As it works, internal ID in form's HTML is rendered correctly, but text for item is not shown the same time.
Aslo, it can be problem in Java-code, which provide data for vm file (a map of data).
Too few information to understand, which code contains a problem. Can you post screenshot of it?
Looks like a bug in Gadget's code. There are several bugs in JIRA's bugtracker about problems with this gadget and strings with underscore, slash and other symbols (in user names/logins, project codes, etc).
Please, check your filters. If it doesn't contain any suspicious symbols in any part of it, you should create a bug in https://jira.atlassian.com
I see from the Marketplace listing that the issue tracker for this plugin is in Bitbucket. An issue was logged for the empty dropdown box problem just a few days after this question was posted:
I really liked this plugin. What a pity that there's still no fix for the defect.
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