This sounds like a platform bug. You should report that to service desk. I've reported similar bug and I hope it'll be fixed soon.
Hi,
I am also having the same problem. On EAs/Indicators that have worked previously.
It only seems to be on DEMO accounts though??

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Hi,
Compilation :
Attachement to a chart :
Previous attachement to the same previous chart : successful.
Any idea ?
PS 1 : After check, all EA compiled from that compiler produce the invalid ex5 file error. (MetaEditor 5.00 1325). Gonna check with a new version.
PS 2 : Okay, so using the last version, the compilation works, but init failed. I've watched my init(), and it appears all lines are well executed, excepted that "f*ing" (sorry, enough to turn vulgar) one :
That class on that compiler, compiled with no errors :