Actually, I continue to struggle with this. Opening certain Web journals causes Aperture to crash. A bit of the crash report is shown below, which not surprisigly seems to show it crashes during the rendering of a Web page. These Web journals have several things in common--they include TIFFs stored on a networked disk as "referenced files", and the Web journals use the "Proofs" template.
Since experiencing the original problem I have upgraded from an older MacBook Pro running Lion to a new MacBook Pro running Mountain Lion 10.8.1. More than doubling the available memory and having a fast CPU and the current GPU hasn't made any difference in regards to this problem, although Aperture runs much faster.
I have found a potential workaround. If I select the Web journal in the Inspector, it will begin to render the Web page and the page thumbnails, and then quickly crashes. If before the crash I quickly hit the "v" key twice to show only the Browser, and not the Web page, it will not crash as it's not rendering the Web page and thumbnails. If I then select another folder, album, or other entity in the Inspector, I'm able to do other work or quit Aperture gracefully. When I launch Aperture again, I will be able to visit the previously offending Web journal, viewing the Web page and thumbnails, without a crash. This works now but I don't know if this will continue to work.
But in any event Aperture should not be crashing regularly during normal use. I am fairly certain all of this crept into the program with version 3.3 and the changes to the structurre of the Aperture database. I'd really appreciate it if anyone has any ideas as to why this might be occurring.
BTW, speaking of Web journals, I wish Apple would include some new templates with one of these new versions. The Web journal template list, which is pretty minimal, hasn't changed at all in the 6 years the program has been around.
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Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 com.apple.WebCore 0x00007fff87c855e0 WebCore::RenderBlock::paintFloats(WebCore::PaintInfo&, WebCore::IntPoint const&, bool) + 256
1 com.apple.WebCore 0x00007fff87c85cb3 WebCore::RenderBlock::paintObject(WebCore::PaintInfo&, WebCore::IntPoint const&) + 467
2 com.apple.WebCore 0x00007fff87c84a3c WebCore::RenderBlock::paint(WebCore::PaintInfo&, WebCore::IntPoint const&) + 236
3 com.apple.WebCore 0x00007fff87c855b2 WebCore::RenderBlock::paintFloats(WebCore::PaintInfo&, WebCore::IntPoint const&, bool) + 210
4 com.apple.WebCore 0x00007fff87c85cb3 WebCore::RenderBlock::paintObject(WebCore::PaintInfo&, WebCore::IntPoint const&) + 467
5 com.apple.WebCore 0x00007fff87c84a3c WebCore::RenderBlock::paint(WebCore::PaintInfo&, WebCore::IntPoint const&) + 236