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What FPGA are you compiling for? Some of them (ex: Stratix) require a subscription edition of Quartus.
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I use Stratix IV GX, EP4SGX230KF40C2, i need just confirmation from you, when i buy a license, my problem will be resolved, and also will resolved the second major problem for me that is " i have a program that is running on my processor. This program takes about the same amount of time whether the system clock is one frequency or a faster frequency.", i note that the second problem is mentionned in this threads
http://www.alteraforum.com/forum/showthread.php?t=31248&page=2.
Please reply to this to buy a license.
Think you.