Hi there! Let me first introduce a test case.
Example content:
===
* DONE Task A :tag1:
CLOCK: [2016-01-09 Sat 04:36]--[2016-01-09 Sat 05:20] => 0:44
* DONE Task B :tag2:
CLOCK: [2016-01-09 Sat 05:20]--[2016-01-09 Sat 05:37] => 0:17
#+BEGIN: clocktable :maxlevel 2 :scope file :formula % :properties ("TAGS")
#+END:
===
After running org-dblock-update, this was the result (note the % column):
===
#+BEGIN: clocktable :maxlevel 2 :scope file :formula % :properties ("TAGS")
#+CAPTION: Clock summary at [2016-01-09 Sat 05:49]
| TAGS | Headline | Time | % |
|--------+--------------+--------+-----|
| | *Total time* | *1:01* | 0.0 |
|--------+--------------+--------+-----|
| :tag1: | DONE Task A | 0:44 | 0.0 |
| :tag2: | DONE Task B | 0:17 | 0.0 |
#+TBLFM: $4='(org-clock-time% @2$2 $2..$3);%.1f
#+END:
===
If I remove the :properties parameters the percentage values are correct.
I fixed this locally by adding this line both when computing tcol and pcol
around line 2648 of org-clock.el
(if properties (length properties) 0)
Best regards,
Fernando.