Quartus II internal error

Hi while using Quartus 9.0 i have faced the following internal error.

internal error: sub-system: med, file: /quartus/edt/med/med_doc.cpp, line: 346

m_number_of_words != 0

stack trace:

0x15daf : _dllmain@12 + 0x348f (edt_med)

0x37d8a : afc_editor_template::open_document_file + 0x35a (gcl_afc)

0x460b5 : afc_template_manager::open_document_file + 0x7d5 (gcl_afc)

end-trace

the Quartus II crashes as soon as we cancel the window. The error arrives when I try to read the contents of the embedded memory at a breakpoint in the simulation time.using processing> simulation debug > embedded memory

I used to do the same in Quartus 8.0 but there was no such issues involved.Is it related to some settings in the software or a bug in the software itself.

Is there any solution to this problem???

Please help!!!