Your RSS feeds can be validated @ http://validator.w3.org/feed/

Running your feed through the validator looks like where "generator" is expecting the name of the software which created the feed, it's actually receiving the website name and the software -- in UBBT's case, the forum title string ( {$config.COMMUNITY_TITLE} ).

solution 1:
Remove the "&" symbol from your site title. Replace with with "&" or "and", to make your title string "HTML Friendly"

solution 2:
The entire <generator>blah blah</generator> is completely optional and only necessary for tracking purposes. It can be removed entirely.
ref1: http://validator.w3.org/feed/docs/rss2.html
ref2: http://www.rssboard.org/rss-profile#element-channel-generator

Find and remove the following line from templates/myfeeds.tpl
Code
		<generator>{$config.COMMUNITY_TITLE}</generator>

Find and remove the following line from templates/rss_xml.tpl
Code
		<generator>{$config.COMMUNITY_TITLE} - UBB.threads(tm)</generator>

Using any "generator" tags -- even without with version numbers -- in web code, can make it easier for an attacker to search out exploits to use if he wanted to breach your website's security.

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UBBT BUG: The "{$config.COMMUNITY_TITLE}" string should not even be in the generator meta field, because it is not a generator, it is a title.

Current developer of UBB.threads PHP Forum Software
Current Release: UBBT 7.7.5 // Preview: UBBT 8.0.0
isaac @ id242.com // my forum @ CelicaHobby.com