Bit more of an update:
- I searched for zips.dll and that wasn't there
- I did the full uninstall, reboot and reinstall of flash10 though ie and still have the same issue
- I uninstalled, rebooted and installed flash8 as per this but when I started RR with DigitalFX the clock and the guages looked terrible (blockly, sections missing etc.) I didn't get to test if that would fix the hanging problem as it would have been an unusable solution.
So looks like Flash8 is too old and Flash10 causes the hanging problems, according to the DigitalFX guide "You can also reduce your hardware acceleration, and this has helped cure the flash problem for many people." so I'll give that a try next. I'm open to any other ideas :)