Yes, the dump was on the install. Sorry but i spoke to much to my friend so he chikened out. He didnt installed priiload. The only thing i can do to help you its tell you the steps i took to have the error:
The system menu was a virgin 4.2U. FIrst i installed the trucha bug, then the wanikokos cios and then the hermes cios. The I patched the ios 70(System menu as you know) using ios 36(the one i trucha-buged) to run wads from SD card menu. Then i installed priiloader for security cause my wii was lu64+(couldnt install bootmii in boot2). Then, in the priiload install, the dump code and the exception took place. So, i restarted the wii and the priiloader screen appeared as normal, the isuue was that attempting to enter system menu only made the screen flicker. So using wad manager i installed the same ssytem menu i had, then i installed priiloader again whitout issues. This i think its important. Why the code dump then and now with the system menu just reinstalled, the issue gone? what's the difference between both? the patched ios 70? Perhaps that differendce determines if the exception take place or not.