Updating the symbol leading to .sof not working even though logically not changed anything due to library.

Hi Intel,

Please help on the below point as this becoming a buring issue for us to solve:

There is one peculiar problem that we are facing these days with projects(I am not sure whether it may be altera quartus tool handling problem also)

The problem is as follows:

There is a project in my(@venkatesh) Downloads folder, where as in that if we didn't update anything just as a reference project it is there.

And from that when we take and copy that project for changing purpose, if there is no any peripheral related connections change we need to not to update any schematic of the project of the project but if we need any change the following error is coming:

To correct this error I(@venkatesh) was adding project path into library as follows:

and then update of the IP in the schematic happens sucessfully:

But, the main problem starts here only that after that making the sof file and checking the sof file resulting in not working.

Wanted to know what might be the reasons for that.

One more Interesting point is that to say logically something is wrong, if I remove that libary path, then .sof file generated is working fine where as for the same symbol block, if I add library and then generate .sof is not working.

But why I need to update the symbol is that, I am upgrading my project where as now one ddr controller is there in that and I want to make two ddr controller and control two ddr ram, for that the symbol peripherals changes and then I have to update the symbol in schematic.

Tool used is quartus 14.1, there is no much information also on this error in internet to get help.

Any help and suggestion is appreciated.