I believe this is an issue with old operating systems. What OS are you using?
You may need to revert to an older client version or use the HTML5 client.

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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z) Probability

btw, Glitch, this is exactly what I was describing a couple months ago. This is what I get when using latest client version. I use older version of client. Once in awhile I try newer client version, but still get same as above.

Using an older client is not a great solution since you may be missing out on important updates. Probably better using the browser unless you have severe performance issues.

__________________
Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z) Probability