Quartus freezes when selecting text in editor

[Altera_Forum]

I have the problem that Quartus II sometimes freezes when I select text in the built in text editor. Quartus then does not react to anything except ctrl+c. 

I have seen this with Quartus II 11.1sp2, 12.0 and 12.0sp1 on Fedora 16.  At first it appears to happen randomly, but I have found a way to reproduce reliably (with 12.0sp1):  1. create a verilog file in a project 2. add the line "reg [7:0] foo=8'd0;" 3. save 4. select the last zero (marked in blue) with your mouse from left to right 5. Quartus is frozen  After some more testing it seems to be connected to the "Highlight similar instances of a selected word"-feature. When it is disabled in "Options"->"Text Editor", Quartus does not freeze.  Can anybody else reproduce this?

[Altera_Forum]

I can recreate this error on Quartus v12.0 SP1 on a Windows 7 64-bit system with your instructions.

[Altera_Forum]

Hi, 

got identical behaviour with VHDL file running Quartus II v12.0 SP1 on Win7 Ultimate 64Bit... Most times I selected text, copied to memory, scrolled to where the line should be copied to, selected the "to be replaced" phrase and with selecting, Quartus freezes...

[Altera_Forum]

It seems like you have a good test case. I suggest opening a support case with Altera with it giving them the same instructions for reproducing the issue. 

 By the way, I confirmed it in Quartus 12.0 64 bit under Ubuntu 10.04  Since it is happening in both Windows and Linux and you have an easy to reproduce test case, they should have no problem identifying the issue.  Pete

[Altera_Forum]

Thank you all for your answers. 

 I have opened a service request with Altera now. I wanted to make sure it is reproducible not just by me before doing so.