We are running Forms 10.1.2.3 on IE 8. The version of JRE is 1.6.0_22.You may well be dealing with a bug. I recommend you check My Oracle Support (MOS) (your Forms version implies you have a support contract) and verify. If you find nothing in MOS, I suggest you upgrade your JRE to the latest version (1.6.0_24) - which is what Oracle Support will likely recommend. If upgrading the JRE doesn't fix the issue, then I would open a service request with Oracle.