I have experienced massive corruption of log files using mIRC 6.12. It mostly happens to logs of active channels but can happen in any...
Here's an example
[21:11:45] <+Bruce> hi
[21:16:55] <@rapty> Oh ffs.
(17 null bytes)e +
[18:06:21] <+Patamon> ;\
almost a whole day worth of logs missing there... then a little further down:
[18:36:26] *** ChanServ sets mode: +h Guinevere
(432 null bytes)
t|(ºÂp8€ä#Ç;ÝX~¥z¿Tð㜳‡-½€R©àÙ?„¢Ïm釪l
…½aú’™ÖR™`ê§$t§ÉÃ’´<¬¹VU™Ø—Y:jÓSªÐaRm,Zu×/e*Wü(null byte)8ŽW†)\¿í(.êï×jJnO‘>GnVØÐ\B—·Um·#;vënêÐPËÌ?Ž•”—F«R§ÆMJ‹wk¨Ýn©×(5Q-*Vj<E»îî.Ãi×¹¥Å L¡ HÜF’Š'yé(null byte)ÇZ¦ðîÜÖÌjªÇy¹õå(null byte)ஞÍþÙt(ùrIA«»ÖMåÚøifÑ“í7"•\Ýý‘“~±ØÀØ•„’Vp¶‰Ô²©Çʹ+ŠQÓseUT"ÉÕÛ¼gâ-޳í_äfÃhpÉ)µ ”&ÊfÔ+§´Gva_ì4oÑ>ªl5çîñWå8yVŠmnã`4©W]•ÑÝ¥DÀÀéiÇÐ ÃXPpºj‰¾~
\&&ˆ6M”…[óå-ZÛzçH
]ÑÞ]Ò/ü'ãèÞ»Kr©X^³ëkyü“ÙOvÞ[qgÙµqù™á+Ð0L×{1+bŒŽn”-RWŽ•nÖÅ0ö-ŠQe6“=!œ('TÉd¥«¼B)'V„Œep'œ²‹¾£~®¿‘x×,=äŒÆqY$<úÝrÞo&¼ÂñÚ×96ÞI¦Åì¾Õ%ºåÚhkòm¢·NÄîN0Þš7X‡3&Ê;"uÈ¡J"Ç#Þüqâò¿éö–{
“®êT¡rÛIüÂé‘çŽÌÏ‚i]m°É6fm—ÂçLHÛaçg•‰}¤«¹œ¨ùA³[¦îMM§ß
21µÃ)¬9çë‡À^¸Œ¶ÇaUŒ™SÌDÄÂUt2øgÇ*n©;Vì5
)I™šŠQ>Ãr¼r̾x.‰ŠMTêü·ÉY+5ôCà Ø¬ô76;Ô|:Ì3Qáë A/3Û(Ù¢†MóRHƒGjLb€œ8äC<Ä»zC ¥Æ{«‘ÇGåãorލÍZ“9\7Þr„1½2.«öW°´6ª“ˆ×j¥¤Ü¬iË×goY™†VAÔ¨I$:†Q'mœ¦‘N†-j.ïŸÙB § uEf¼ûÙFîæ%·N&ÒâÚùœˆ–ÌÍñ$ÁÝyºG!•®$i7s²Â-ˆ‰&鈦&@8jÛ¥9*í>ÈKÜYVµ,]3×
[®%Õ§©žzz½Ö®ž>èŽ8/¥ž¹ýiqëƒCÃJ§½¼€¡Æ´‘•‹lôÒU¯±BBo®ÄDÕdÙâ€ÄTˆ\‹"Ó
Session Start: Mon Nov 17 07:03:57 2003
another 2 days lost