Builds 11/22/2012 and 11/16/2012 crashing on uploads tab

Hello, I'm having trouble with these two builds on Windows 7. The crashes only happen when I try the uploads tab, the client also gets very slow sometimes when I open the uploads tab. The crashes seem to happen after heavy RAM usage (I only have 4 gigabytes). At first, I thought a big queue might be causing this (more than 100 users), but now I'm not so sure as I did some tests with a smaller queue and I still got crashes. I can also force it to crash with the expand folders and expand users buttons, but this is only possible with big queues.

Here are the crash logs, the last who lines on call stack kept repeating.

SoulseekQt.exe caused a Stack Overflow at location 65161604 in module QtGui4.dll.

Registers:
eax=00000040 ebx=06ab4a20 ecx=0028ccc8 edx=0d75f168 esi=014de1c4 edi=0000232e
eip=65161604 esp=00092f80 ebp=000930c8 iopl=0 nv up ei pl nz na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210202

Call stack:
65161604 QtGui4.dll:65161604 _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore
65161943 QtGui4.dll:65161943 _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore
65161943 QtGui4.dll:65161943 _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore

//////////////////////////////

SoulseekQt.exe caused a Stack Overflow at location 651615f1 in module QtGui4.dll.

Registers:
eax=02d6e1b8 ebx=1321deb8 ecx=0028d688 edx=0375d128 esi=02d6e1c4 edi=00000aef
eip=651615f1 esp=00093000 ebp=00093008 iopl=0 nv up ei pl nz ac pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210212

Call stack:
651615F1 QtGui4.dll:651615F1 _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore
65161943 QtGui4.dll:65161943 _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore
65161943 QtGui4.dll:65161943 _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore

//////////////////////////////

This last crash log seems to be different. Access violation instead of stack overflow. The only thing I did differently here was opening the program from the tray, uploads tab was already open.

SoulseekQt.exe caused an Access Violation at location 6516169d in module QtGui4.dll Writing to location 00090ffc.

Registers:
eax=00091110 ebx=12c48a20 ecx=00091278 edx=02d3ea24 esi=13430230 edi=00001a63
eip=6516169d esp=00091000 ebp=00091148 iopl=0 nv up ei pl nz na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210202

Call stack:
6516169D QtGui4.dll:6516169D _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore
65161943 QtGui4.dll:65161943 _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore
65161943 QtGui4.dll:65161943 _ZN14QWidgetPrivate22paintSiblingsRecursiveEP12QPaintDeviceRK5QListIP7QObjectEiRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore