I couldn't find anything on the CRA website either, but here's a quote from bnnbloomberg that does seem to put the blame on CRA. Google also shows that users of other tax software have the same complaint.
[quote begins here.]
The Canada Revenue Agency previously warned the system updates required to process capital gains “may not be completed” by the time online filing opened on Feb. 24, but there have been no updates since.
Drouin [from CRA] told CTV News the CRA is currently targeting mid-March, but that it could take longer.
“We’re pretty confident it will be fixed within a week or two,” he said. “But to be safe, I tell people to wait until the end of March. Don’t rush.”
For taxpayers impacted by the delay, the CRA has promised relief from late-filing penalties and interest until June 2 for individual filers and May 1 for trust filers.
[ I'd play it safe and not trust the promise of June 2 until I see it on the CRA website]
