Core dumps - could a mod be causing these?

[moonclamp]

I'm getting a whole load of "core.xxxxx" files appearing in my forum root (xxxx being a seemingly random number)

These files are roughly 5 megs in size and appearing a couple of times every hour. It seems that they are generated by the server when a script fails to execute correctly.

My installed mods include:

show visitors on index
sigmachat integration
vbadvanced gallery (different directory though)
vbadvanced cms (directory above the forums)
moderator permissions
vbjournal
gallery images on index
lock out anyone under 18 hack
signature options

possibly a couple more that I can't remember right now.

Can anyone tell me if they have had similar issues and how they dealt with them ... or better still how to deal with them with no shell access to the server.