Quartus II Crashes

Hello,

I am running Quartus II 32-bit Version 12.0 Build 263 08/02/2012 Web Edition,

with Service Pack Installed: 2

on Windows 7.

I am using schematic design entry in the Block Editor. I create a new design and compile it without problems. I then make a simple edit, for example re-naming a pin, save the file, and attempt to compile again, and it crashes.

The crash report window says:

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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, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_hdb_iname, GED_VIEW::get_sld_hdb_iname, GEDQ_VIEW::get_sld_h

Stack Trace:

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

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

.... lots more lines like above ....

End-trace

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

Service Pack Installed: 2

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When I re-launch Quartus and compile the edited .bdf file there is no problem.

The above behaviour happens consistently, every time.

Am I doing something wrong, or is my installation incorrect, or is it a bug?

If the latter, how do I report it?

Thanks for any help, Ken.