on remote X connections and we provide the \\use_qimage preference
variable, which brings back the old way of painting (when set to false).
+- BibTeX errors are now processed and cause the document to fail
+ compilation. Before, these errors were ignored, which means that it
+ may happen that documents that did compile with a previous version
+ do not compile anymore with LyX 2.1.x. To solve this, one needs to
+ fix the offending BibTeX errors in the document.
+