All APAR's for the WebGUI were before SR3
10.0.4.0: https://www.ibm.com/support/pages/apar/IT38285
10.0.4.0-SR2: https://www.ibm.com/support/pages/apar/IT42300
Ideally you should be on 10.5.0.x, 10.0.4.0 was a continuous delivery release, but it has all those features in 10.5 now and 10.0.4.0 does not even have the latest fixes (overall).
In this case if the issue persists on 10.5, you should open a case with support since more details of what pages are not working and debug logs will be needed.
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DOMINIC MICALE
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