We currently use the µVision 1 environment includig C51/V5.xx. We now want to update to µVision-2 / C51 V6.22. Cause we want to be sure the new version works without any problems we are currently testing the new version before using it for our developments. The import-feature of µV-2 works proper, but when we want to use the new optimizing-levels 7, 8 and 9 of the compiler, the code would be compiled without an error but doesn't work correctly. When limiting the optimizing-level to 6, also µV-2 will produce "working" code. Has anybody made similar experiences? Are there any known bugs in version 6.22? Best regards Andy