We use different task which are parametrized. When starting the build the user enters some information. The job uses an ant script to do its work. In this script we accessed the parametrized data as follow:

<property environment="env"/>
<target name="hudson">
<!-- Determines if we need to update the version -->
<condition property="needVersionChange">
<istrue value="${env.CHANGE_VERSION}"/>
</condition>
<echo>Need Version Change? ${needVersionChange}</echo>
...
</target>

Whereas the parameter field is configured as follows:
Type: Drop-down
Name: change_version
Values: No Yes

This was working now for around 6 Month without a problem. The lowercase field name was transformed to a uppercase environment name. I found this problem yesterday doing using hudson 1.347. The problem happens for all jobs independent if their are running on the windows node or on the mac itself.

One workaround to fix it is to change the field configuration to use a uppercase name. But as I didn't found any information in the change log about a change in this part I hope I get a confirmation that this change was intended and this is the best solution to it.

I also tried downgrading to the last two used versions (1.346 and 1.345) but the problem exist there also.