Here are the changes:
Fixed StringSplit to work properly inside functions of compiled scripts
(broken by 1.0.35.01). [thanks engunneer & Lexikos]
Fixed SendPlay not to wait for the release of the Windows key prior to
sending an "L" keystroke (broken by 1.0.48.01). [thanks Lexikos]
Fixed A_EndChar to be valid when the B0 option is present, and to be empty
when there is no ending character (broken by 1.0.44.09). [thanks Al2000]
Fixed FormatTime to yield a valid time of day even when the specified month
is out-of-range (broken by 1.0.48.00). [thanks silveredge78]
Fixed FileCreateDir to support a leading backslash even when it is the only
backslash; e.g. \dir. [thanks jaco0646]
Fixed GuiControl/GuiControlGet/Gui/SendMessage to work reliably even when
they trigger a callback or OnMessage function. [thanks Lexikos]
Fixed RegExMatch() not to produce too few replacements when an empty-string
match is followed by a non-empty-string match.
Changed "While()" to be recognized as a loop rather than a function. [thanks
Crash&Burn]
Improved UrlDownloadToFile to support FTP and Gopher. [thanks Lexikos]
Improved the stdout/asterisk mode of FileAppend to write immediately rather
than lazily to standard output. [thanks Lexikos]
Added full support for "if % expression". [thanks kenomby]
Download it at http://www.autohotkey.com/download/