Task tile disappeared after click

[strobe]

If I clicked to any task title (in Sprints/Task tabs), content of div class="task_subject" is disappear with this error in console:
Uncaught TypeError: Object [object Object] has no method 'textPlaceholder'

Environment:
Redmine version 2.2.0.devel
Ruby version 1.8.7 (x86_64-linux)
Rails version 3.2.9
Environment production
Database adapter MySQL
Redmine plugins:
AgileDwarf 0.0.3

[crovegno]

The problem is motivated by a conflict between JQuery and Prototype in jquery.jeditable.ptext.js. Replace "$(...)" by "jQuery(...)" will solve the problem.

[adrenochrom]

Same Problem here.
After the fix from the author above the title didn't disappear.
But the [+X] Button for adding additional needed time is not working.

Environment:
Redmine version 2.3.1.stable
Ruby version 1.9.3 (x86_64-linux)
Rails version 3.2.13
Environment production
Database adapter Mysql2
Redmine plugins:
AgileDwarf 0.0.3
redmine_testlinklink 1.0.0
redmine_wiki_extensions 0.6.3