Using 3.7.3 PL 1 I too get a blank screen when attempting to subscribe to a forum.
I tried doing what you suggested ...copying the RSS link to a new browser window and disabling your plugin (and setting all the External Data settings to yes in vBull options) but still a blank screen....
Anything else you suggest I should try?
BTW the icon appears on all the forum sections on my main index but links to the same (private) forums I listed in yr plugin options...but that may be because I am logged in as an Admin?
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