This is a known problem with the list code parser. At the moment, the main fix relies on a feature that has been pushed off to an undefined future release (see sub listify in ubb_lib, and the commented out code in UBBCode_core - it says 6.5, but it lies). As a temporary workaround, add a type attribute of A, a, or 1 to the ul tag to ensure it gets converted into a [list].
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Charles Capps
UBB.classic™ Developer
Having problems? Open up a support ticket!