I have a lot of those in the log, by the way:
System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: length
at Devsense.PHP.Text.Span..ctor(Int32 start, Int32 length)
at Devsense.Twig.Parser.TwigLexer.UpdateTokenPosition()
at Devsense.Twig.Parser.TwigLexer.GetNextToken()
at Devsense.VisualStudio.Twig.Code.TwigTokenCache.Update(ITextSnapshot snapshot)
at Devsense.VisualStudio.Twig.Code.TwigTokenCache.GetErrors(SnapshotSpan position)
at Devsense.VisualStudio.Twig.Errors.TwigErrorTagger.GetErrors(SnapshotSpan span)
at Devsense.VisualStudio.Twig.Errors.TwigErrorTagger.GetTags(NormalizedSnapshotSpanCollection spans)
at Microsoft.VisualStudio.Text.Tagging.Implementation.TagAggregator`1.<GetTagsForBuffer>d__47.MoveNext()