Quartus 12 sp2 constant crashing

Quartus II v12 SP2 is constantly crashing on me and I get this error box, has anybody else had this issue? I have just checked and it happens if i update a symbol in a schematic and then try to compile again!

Internal Error: Sub-system: DBMUI, File: /quartus/db/dbmui/dbmui_manager.cpp, Line: 1152

Attempt made to free all hierarchy databases but the following callers are still accessing it: GEDQ_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname

Stack Trace:

0x61c9: DBMUI_MANAGER::close_hdb_all_cap_inst + 0x109 (DB_DBMUI)

0x6ee7: DBMUI_MANAGER::flow_has_started + 0x27 (DB_DBMUI)

0x7035: DBMUI_MANAGER::on_flow_start + 0x45 (DB_DBMUI)

0x11fb: NTFQ_NOTIFY_TARGET::dispatch_notify_msg + 0x3b (ccl_ntfq)

0x1312: NTFQ_NOTIFY_TARGET::on_ntfq_notify + 0x22 (ccl_ntfq)

0x1730: NTFQ_NOTIFY_MGR::broadcast_notify + 0x60 (ccl_ntfq)

0x1937: ntfq_broadcast_notify + 0x17 (ccl_ntfq)

0x589c: flow_call_cmd + 0x12c (sys_flow)

0x11066: flow_generic_call + 0x66 (sys_flow)

0x185cc: flow_do_tm_portion + 0x10c (sys_flow)

0x1ea49: flow_full_compile_or_simulate + 0x13f9 (sys_flow)

0x1f2ff: flow_compile + 0x1f (sys_flow)

0x14fbc: _flow_execute_custom + 0x6ac (sys_flow)

0x15a75: _flow_execute + 0x45 (sys_flow)

0x78c52: QUI_APP::on_start_flow + 0x2a2 (SYS_QUI)

0x5c79a: QUI_APP::qt_metacall + 0xba (SYS_QUI)

0xe0eae: QMetaObject::metacall + 0x3e (QtCore4)

0x1c6b9: QApplication::event + 0x359 (QtGui4)

0xfcba2: QEventDispatcherWin32::event + 0x112 (QtCore4)

0xdbaac: QCoreApplicationPrivate::sendThroughApplicationEventFilters + 0x5c (QtCore4)

0x1d068: QApplicationPrivate::notify_helper + 0xb8 (QtGui4)

0x1f94c: QApplication::notify + 0x136c (QtGui4)

0x79a73: QApplication::restoreOverrideCursor + 0x2463 (QtGui4)

End-trace

Quartus II 32-bit Version 12.0 Build 263 08/02/2012 SJ Web Edition

Service Pack Installed: 2