5.7 and java

Hi can anybody tell me which version of java i need to run with rx 5.7. it has just stopped working (ephox deletes content). somebody suggested that this was because i had a newer version of java than was needed. so i reverted to the earliest version on my pc - that didn’t work, so gradually moved up versions with no luck. please help.

We used to be succesful reverting back to approx version 6 update 3… (later ones may work, but try this for starters)