Currently we have a limit in place which says a single CSDL rule can not exceed 1MB. Typically a list of approximately 90K Twitter user IDs will exceed this limit.
The work-around is to group multiple 'sub-streams' into one 'master-stream':
Stream hash 12345678:
twitter.user.id in [1, 2, ..., 90000]
Stream hash 98765432:
twitter.user.id in [90001, 90002, ..., 180000]
stream "12345678" or stream "98765432" or stream "..."
Take a look at the 'stream' keyword documentation for full details. We will soon be releasing functionality which will allow you to include much larger user / keyword lists in your streams without the need to split up your query.