[Courier-imap] imapd: Failed to create cache file: maildirwatch and FAM notification error

Hi all guys.. as all well know i am on a courier cruzade and found an interesting note about this.. of course this only apply on 1.0.14 and lower older releases, 1.0.16+ dont use FAM anymore.. i noted that on faq it limits to said "its not running" https://www.courier-mta.org/FAQ.html#fam but

[Courier-imap] FTS seems is broken? or incompatible with rounducbe

i have a 17500 messages account that worked with older debian squeeze courier suite and roundcube 0.9 client.. after upgrading to 1.0.14 and roudcube 1.4 any search does not work.. what is the probabilitys of this problem be in courier? i just provide same configuration .. (of course roundcube