"I" don't have a "problem" with the caps. Just by simple "common sense and logic" of how human digestion works, the caps are not a good idea and not the most "effective" way to take the cayenne. Two of the worlds best known naturopath, herbalists and healers Dr Schulz and Dr Christopher who are staunch proponents of the healing properties of cayenne also don't recomend taking the caps.
Several folks on the forum have reported having had problems with the caps either not breaking till it got their colons and "burning their butts off and others breaking out in heavy sweats. At least these folks realized that it was the caps. I have no doubt whatsover that many others that have had adverse reactions while on the Master-Cleanse and they were cap takers have not made the connection that the caps have been the cause.
Check out the link below where I've outlined the logic why caps are not a good idea. Also in that same post there are sugestions of how folks have coped with the cayenne including one very well though out approach if you "must" take the caps.