Stash connected to JIRA or Crowd results in an invalid XML character

2014-03-17 09:57:13,950 ERROR [scheduler_Worker-4]  c.a.c.d.DbCachingDirectoryPoller Error occurred while refreshing the cache for directory [ 32770 ].
javax.xml.bind.DataBindingException: javax.xml.bind.UnmarshalException
 - with linked exception:
[org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1082; An invalid XML character (Unicode: 0x1) was found in the element content of the document.]
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Caused by: org.xml.sax.SAXParseException: An invalid XML character (Unicode: 0x1) was found in the element content of the document.
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2013-12-07 22:41:53,581 ERROR [qtp16566588-196 ] fisheye DefaultUserManager-getOrImportUser - Could not authenticate user "jira.test"
com.cenqua.fisheye.user.AuthenticationException: Problem communicating with Crowd
        at com.cenqua.fisheye.user.crowd.CrowdAuth.authenticate(CrowdAuth.java:261)
        at com.cenqua.fisheye.user.DefaultUserManager.getOrImportUser(DefaultUserManager.java:611)
        at com.cenqua.fisheye.user.DefaultUserManager.loginWithSanitizedUserName(DefaultUserManager.java:428)
        at com.cenqua.fisheye.user.DefaultUserManager.login(DefaultUserManager.java:402)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
        at com.sun.proxy.$Proxy44.login(Unknown Source)
        at com.cenqua.fisheye.web.LoginServlet.login(LoginServlet.java:115)
        at com.cenqua.fisheye.web.LoginServlet.doLogin(LoginServlet.java:74)
        at com.cenqua.fisheye.web.LoginServlet.doGet(LoginServlet.java:60)
[....]
 - with linked exception:
[org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 460; An invalid XML character (Unicode: 0xe) was found in the element content of the document.]
        at javax.xml.bind.JAXB.unmarshal(JAXB.java:226)
        at com.atlassian.crowd.integration.rest.service.RestExecutor$MethodExecutor.andReceive(RestExecutor.java:349)
        at com.atlassian.crowd.integration.rest.service.RestCrowdClient.authenticateUser(RestCrowdClient.java:115)
        at com.cenqua.fisheye.user.crowd.CrowdAuth$3.call(CrowdAuth.java:235)
        at com.cenqua.fisheye.user.crowd.CrowdAuth$3.call(CrowdAuth.java:225)