A new minor release of the IPT (v2.3.1) has been released and is available for download here [1]. 

This minor release fixes a bug [2] limited to IPT version 2.3, and affects resources whose metadata:

To fix the problem, please upgrade to 2.3.1 and fix badly encoded characters in your metadata.

Instructions on how to upgrade your IPT can be found in the IPT’s Release Notes [3].

Sorry for the inconvenience this bug may have caused you,

Kyle

[1] http://repository.gbif.org/content/groups/gbif/org/gbif/ipt/2.3.1/ipt-2.3.1.war

[2] https://github.com/gbif/ipt/issues/1197

[3] https://github.com/gbif/ipt/wiki/IPTReleaseNotes23.wiki