Hi Maria,
Historically FSBPro had a maximum bar limit of 50k bars (I believe it was pre version 4.0). Can you please check what version of FSBPro you are using as this could be as simply as installing the latest version in which this limit was increased to 200k.
If the problem persists with the latest version then let me know? And of course make sure you change the 50,000 default to 200,000 as shown below.
Cheers,