This release supports only Flex 4.0 and Flash Builder 4.0 Pre-Release builds 01/19/2010 or later.

An intermittent bug which caused the Potomac builder to hang has been found and resolved. Users should not encounter any more freeze or hang scenarios while using Potomac.

Potomac now includes a preference page for configuring the ignored metadata (i.e. all other metadata is validated by the Potomac compiler and unknown metadata gets a warning). Users can add or remove tags they wish Potomac to ignore. The default list of ignored metadata has been updated to include all known Flex standard metadata including Flex 4 and Flex Unit tags.