I know this Question is old and probably not relevant for you anymore, however I stumbled over the same Issue and wanted to share a possible solution. I could not find any documentation on why mvindex is not working with negative values in the Dasboards, however there is a workaround.   <eval token="mvIndexValue">mvcount(<mvfield>)-1</eval> <eval token="lastValue">mvindex(<mvfield>, $mvIndexValue$)</eval>   I think it's pretty ugly, but so far I have not found a better solution 😕 ... View more

Looks promising, thanks! ... View more

This works great, thank you! ... View more

yes, both of the options i wrote above worked in 6.6.3, but your original token with just $row._time$ gave me the same result you saw. ... View more