Since the scripts for the pits and Beat Call were changed for v5b, outside-area pits in some of the levels (mostly ones where Beat Call is not available) were not altered to have Beat Call function properly. Instead the player becomes invulnerable to the pit damage and Beat Call says inactive.
Maps affected: MM1GUT, MM1OIL* ,MM2BUB, MM3SNA, MM3TOP, MM4TOA, MM4RIN, MM4DW1**, MM5CHA, MM5STO, MM5NAP, MM5CRY, MM5DAR, MM6BLI, MM6YAM, MM6MRX, MM7SHA, MM8FRO, MMBDYN, MMBGRO, MMWTBRG, MMCTF02, MMCTF05***, MMCTF08, MMCTF11, MMCTF12, MMCTF18
*Has no pits, but Beat Call makes you immune to damage from the non-lethal oil ponds
**The underwater spike pits register as "drowning" in the code and shouldn't activate Beat Call.
***Works fine on the lava pools, but not any of the pits
MM1BOM, MM2AIR, MM2MET, MM3MAG, MM4BRI, MM5GRA, MM6WIN, MM8CLO, MM9TOR, MMCTF13, MMCTF24 uses the old script, but Beat Call still functions.
(http://i.imgur.com/SZNZtBH.png)