Crash in rkl_getCachedRegexSetToString

Hi,
I've been trying to use RegexKitLite to do some screen scraping for an iPhone app. I've been trying to make sure memory is
being reclaimed properly at this point in m app development. Unfortunately, my app now crashes in a very reproducible way
with the following stack trace:

Full Plate[1117:13c13] *** -[CFString release]: message sent to deallocated instance 0x7bee0a80

#0 0x018ace1e in ___forwarding___ ()
#1 0x018acce2 in __forwarding_prep_0___ ()
#2 0x01852435 in CFRelease ()
#3 0x000fbbee in rkl_clearCachedRegexSetTo (cachedRegex=0x1375cc) at /Volumes/STORAGE/Documents/FullPlate/Classes/Sources/RegexKitLite.m:1696
#4 0x00103978 in rkl_getCachedRegexSetToString (regexString=0x132b0c, options=32, matchString=0x7e8128f0, matchLengthPtr=0xb010269c, matchRange=0xb0102820, error=0xb0102b60, exception=0xb01026a8, status=0xb01026a4) at /Volumes/STORAGE/Documents/FullPlate/Classes/Sources/RegexKitLite.m:1002
#5 0x000f9d92 in rkl_performRegexOp (self=0x7e8128f0, _cmd=0x12061a, regexOp=37, regexString=0x132b0c, options=32, capture=0, matchString=0x7e8128f0, matchRange=0xb0102820, replacementString=0x0, error=0xb0102b60, result=0x0, captureKeysCount=0, captureKeys=0x0, captureKeyIndexes=0x0) at /Volumes/STORAGE/Documents/FullPlate/Classes/Sources/RegexKitLite.m:1119
#6 0x000fcfd2 in -[NSString(RegexKitLiteAdditions) arrayOfCaptureComponentsMatchedByRegex:options:range:error:] (self=0x7e8128f0, _cmd=0x12061a, regex=0x132b0c, options=32, range={location = 0, length = 193038}, error=0xb0102b60) at /Volumes/STORAGE/Documents/FullPlate/Classes/Sources/RegexKitLite.m:2437
#7 0x000e563a in -[AllRecipesManager loadRecipe:withReferer:] (self=0x7bec08b0, _cmd=0x120446, url=0x7cadcb70, referer=0x7cc99ef0) at /Volumes/STORAGE/Documents/FullPlate/Classes/Sources/AllRecipesManager.m:648
#8 0x000e30f4 in -[AllRecipesManager generateRecipes:] (self=0x7bec08b0, _cmd=0x12085e, menuViewController=0x7cc3d100) at /Volumes/STORAGE/Documents/FullPlate/Classes/Sources/AllRecipesManager.m:248
#9 0x003bd4e6 in -[NSThread main] ()
#10 0x003bd457 in __NSThread__main__ ()
#11 0x93f4bed9 in _pthread_start ()
#12 0x93f4f6de in thread_start ()

When I look at the method at the top of the stack, the list of local variables says that cachedRegex->setToString is a freed object. This code is being executed in a thread. The first time I run this thread, I don't see this problem. The second time I run this thread, I invariably get this crash. Strangely, I call

arrayOfCaptureComponentsMatchedByRegex: options: range: error:

twice during the thread code before this crash occurs.