Content Importer Taking A Long Time To Import .IMC Files

[BC4IM2015]

Your IncrediMail Version: 2.5
Your Internet Browser Type: FireFox 3.5
Your Operation System: Windows 7

What have you done before the problem occurred?
N/A

If you receive any error message, please quote it precisely:
No.

Please provide a full description of the problem:
The Content Importer app is taking a very long time to import stand-alone .IMC files that I downloaded previously, when the Gold Gallery was not available. No matter how many times I've tried to import these files, they seem to take, in some cases, almost 24 hours to import. I wouldn't think that this is normal. I really do not know how to fix this, if it is possible. The Content Importer also seems to want to freeze up, which make the importing even longer.