I guess you'd have to try with at.debug() and see what happens. 0.40 sends the text ready right after boot, which is detected and helps to ignore all the random characters. It'd be annoying if 0.50 doesn't do that - but I guess it could be due to the overflow. I'd make sure you're not executing anything that takes a lot of time right after boot though, as that won't help at all.
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I guess you'd have to try with
at.debug()
and see what happens. 0.40 sends the textready
right after boot, which is detected and helps to ignore all the random characters. It'd be annoying if 0.50 doesn't do that - but I guess it could be due to the overflow. I'd make sure you're not executing anything that takes a lot of time right after boot though, as that won't help at all.