Super slow loading Quicktime files?

Hey gang:

Just ran into this issue. Audacity usually opens .mov files within a few minutes, and now it’s taking 20-60 minutes to open them. I’m not sure what happened. I opened a file last night–no issue. Then I opened two files right afterwards (also .mov), and they took forever to open. I’m wondering what I might have done to cause this? I hadn’t actually done anything in between opening the files.

I have an iMac late 2013, 24GB memory, 2.3GH Intel Core i5, with Yosemite 10.10.2.

Any thoughts?

Thanks so much.

I opened a file last night–no issue.

Restart Audacity. Does that same file still open rapidly?