I think the file set should be evaluated on the slave using e.g. hudson.remoting.Callable and copied to the master using getFileLocally. Currently, the file set is evaluated on the master using the workspace path of the slave. That's the problem. I've attached a basic example of a Callable. Is anybody working on the issue? Otherwise I'll fix the issue.

 
launcher.getChannel().call(new RemoteFileTask(build.getWorkspace().getRemote(), vars.expand(filePath)))

 
public class RemoteFileTask implements Callable<String, IOException> {

    private String basePath;
    private String filePath;

    public RemoteFileTask(String basePath, String filePath) {
        this.filePath = filePath;
        this.basePath = basePath;
    }

    public String call() throws IOException {
        FileSet fileSet = Util.createFileSet(new File(basePath),
                filePath, null);
        return fileSet.iterator().next().toString();
    }
}

Code changed in jenkins
User: Tobias Unger
Path:
src/main/java/hockeyapp/HockeyappRecorder.java
http://jenkins-ci.org/commit/hockeyapp-plugin/45f2b0da870fa1d1f3a283abf72e869c35d3e2ca
Log:
[FIXED JENKINS-22848]

Code changed in jenkins
User: Brian Johnson
Path:
src/main/java/hockeyapp/HockeyappRecorder.java
http://jenkins-ci.org/commit/hockeyapp-plugin/276eded7656cf467236ca212b623853858034f0d
Log:
Fixes JENKINS-22848.
Resolve file path on remote for slave nodes.

Code changed in jenkins
User: Tobias Unger
Path:
pom.xml
src/main/java/hockeyapp/HockeyappRecorder.java
http://jenkins-ci.org/commit/hockeyapp-plugin/d06fdf8ab196c3a8e39138f06168da833a4b84ca
Log:
Merge remote-tracking branch 'b2jrock/JENKINS-22848' into merge

Conflicts:
src/main/java/hockeyapp/HockeyappRecorder.java

Not seeing v1.1.0 on my Jenkins update list yet. Still says 1.0.6. Is this normal?

No this is not normal!
I tried to do a release again, but somehow the maven-release-plugin does not work on this machine.
I will hopefully look at this tomorrow, but you want to get the updated plugin right now you can download it here:
https://dl.dropboxusercontent.com/u/8978467/hockeyapp.hpi
and install it manually.

Oliver: There's a bug in Maven Release Plugin, maybe you're hit by that? https://groups.google.com/forum/#!topic/jenkinsci-dev/qkmbl3HrYgk

Installed manually, then - thanks!

@Daniel: That was exactly my problem. I already found this bug yesterday and tried some things, which didn't work out. But now i've got it working with: mvn org.apache.maven.plugins:maven-release-plugin:2.5:perform.
Release doesn't work anyhow, because authorization failed (got my credentials in settings.xml). Will investigate this evening. Thanx!

Got it released with:
mvn org.apache.maven.plugins:maven-release-plugin:2.5:perform -DrepositoryId=maven.jenkins-ci.org
Version 1.1.0 should be available within the next hours.