If it happens again, can you click the Show Bug information button & copy about the first 50-80 lines, that's the most important part. Then post that part in a reply to this post thread. You can post it inside a code bracket. Each report can be a little different due to a different cause & that's what we need we need to find what the cause is.

When you open WireShare, under the WireShare menu > About WireShare, does it say Java 7 or Java 6?

How many incomplete downloads do you have?
How many files are you sharing?
How many files are listed in your library?

When you said the problem was similar to the problem on the page you pointed to, does the program create a folder called .wireshare or .limewire anywhere?

For MacOSX it might be a memory issue. This is something BigJx & I need to sort out. MacOSX's memory use-age is larger than the Windows version uses. If you were using LPE it would probably be worse.