Same here: photos submitted in April, although landed after your mom in February. They gave me the same nonsense too when I called before. A while ago one call agent refused to open my file using the logic that since there was no processing time for people with 'non-compliant' photos (see how they label it as if we have committed a crime!), he could not open my file. I asked what if I called you back in 5 years and my PR card was still not ready. Would you not be able to open my file then? He said no, I wouldn't; that's the procedure. I couldn't help but laughing on the phone.
Now, this is the level of inefficiency and nonsense that CIC is demonstrating! The question is why can they not have a processing time for our cases? Is it because CIC does not publish that publicly, so they can slack off and give them a low priority? Maybe.
The other scenario that came to me recently is they might be treating the envelopes with new photos as a PR renewal case. Since by opening the envelopes with a letter and 2 pictures there is no way of understanding whether the new photos are for a new immigrant or not, they might be sending them to that renewal wait line, which has a processing time of about 90 days now.
Obviously all speculations of mine. CIC's lack of transparency and inefficiency is phenomenal.