Package Hangs On Parallel Upserts

I have data flow tasks, one which validates the import file and one which processes the import file if the validation passed. The validation runs and pushes the three row types to three different recordset destinations. When I enter the processing data flow task, I have three parallel trees processing each recordset saved in the previous task. I'm using a script component to generate the rows which are then sorted and merged with the production database to find existing records. Based on this, I split to an OLE DB command (running an UPDATE command) or OLE DB destination (to simply insert the records.)

In this particular case, all records are being updated and nothing is being inserted new. Two of the three trees will complete the sort but hang on the merge, split, and OLE DB command components. The other will do the same but also hang on the split.

In another case, I truncated each destination table before running the package and the package runs fine.

Are toes being stepped on in the data flow task and causing a deadlock?

Update: I removed the sort transformation and sorted the rows before pushing them to the recordsets and I still get the same results.