Frames are not updated in WebObjects 5.0 when they should be updated.
Solution
Use setPageRefreshOnBackEnabled(false) in your WebObjects application. In WebObjects 5.0 this keeps pages from being cached and frames will work as expected.
Additional information
WebObjects 4.5 and earlier would update frames each time an event occurred such as clicking a submission button. However, in WebObjects 5.0 the caching method is changed. This results in frames not being updated since the contextID is found and assumes that the page was reloaded or backtracked. In the case of frames, a cached page is displayed rather than generating a new page.