Quartus 11.1 incorrectly compiles the design

[Altera_Forum]

Has any one else seen this? 

Q 11.1 incorrectly compiles the design. When trying the same code, qsf, sdc and rest of the project with Q 11.0 sp1, the design is compiled correctly. I do not see any timing errors in Q 11.1 compile.   At present, the only way I can tell that the design doesn't function is by seeing ip hdr chksum errors on the network sniffer.   Any pointers, suggestions while I continue to debug this?   Thanks. Sanjay

[Altera_Forum]

I suggest you try to build in a signal tap to examine and try to isolate what's failing. 

 So far I haven't had any issues with 11.1 but it may be very specific issue with the code you are compiling.  If you can isolate it down to a single section of code, that's in error, you can open a service request to see if you can get a hotfix for it.  I would also double check any false path statements. It may be that the timing across a "false Path" is really critical, and the to routers just placed the logic differently, causing it to run or fail.  Pete

[Altera_Forum]

Everyone using 11.1 should add the following patch: 

 http://www.altera.com/support/kdb/solutions/rd11182011_10.html

[Altera_Forum]

Rysc, 

 This did the trick.  Thank you.