Batches Remain Open

Hello,

I'm not able to trigger open batches to run using the included generate-trigger-file.py script. The trigger file is being dropped into the correct S3 location, but the batch remains in an open status. The batch I'm looking at has the following configuration params:
batchSize = 16
batchSizeBytes = 100,000,000
batchTimeoutSecs = 500.
filenameFilterRegex = *.csv
Currently, the batch has 5 files and has a size of 7184598.

I apologize if this is a duplicate issue, but I couldn't find the solution.

Thanks!