arbitrary subtitles when I press g and y keys

[mlg7]

The g and y keys used to work: g showed a previous subtitle, y showed the next one.
Now, they show some arbitrary other subtitle, and cannot be used for synchronization.

Expected: the g and y keys show the previous/next subtitle, thus allowing to synchronize

Actual: the g and y keys show some other subtitle in the past/future, I suppose, with some overflow because several forward keys eventually bring you back.

I can provide example files, but not as a bug report attachment.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: mplayer 2:1.0~rc4.dfsg1-1ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Mon Nov 28 09:36:05 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: mplayer
UpgradeStatus: No upgrade log present (probably fresh install)