This is typically caused by ending market value being 0.00 for the previous cycle. The solution in one case was to reverse a gift which had been posted to the fund account rather than cash. After that, the questions marks were gone.
Steps to Duplicate1. Go to the FACTS module\Reconciliation\Processes tab for the account in question
2. Go to the Processes tab and run the Pool Allocation Processing
3. Note that the end of day price has question marks instead of values
4. Run the Unitization report, note that for the Unrealized Gains and Losses column there are question marks.