Index: common.scm
==================================================================
--- common.scm
+++ common.scm
@@ -998,11 +998,11 @@
 
 ;; given span of seconds tstart to tend
 ;; find start time to mark and mark delta
 ;;
 (define (common:find-start-mark-and-mark-delta tstart tend)
-  (let* ((deltat   (- tend tstart))
+  (let* ((deltat   (- (max tend (+ tend 10)) tstart)) ;; can't handle runs of less than 4 seconds. Pad it to 10 seconds ...
 	 (result   #f)
 	 (min      60)
 	 (hr       (* 60 60))
 	 (day      (* 24 hr))
 	 (yr       (* 365 day)) ;; year

Index: dashboard.scm
==================================================================
--- dashboard.scm
+++ dashboard.scm
@@ -2656,11 +2656,12 @@
 			       (testsdat  (hash-table-values tests-ht))
 			       (runcomp   (vg:comp-new));; new component for this run
 			       (rows-used (make-hash-table)) ;; keep track of what parts of the rows are used here row1 = (obj1 obj2 ...)
 			       ;; (row-height 4)
 			       (run-start  (dboard:min-max < (map db:test-get-event_time testsdat)))
-			       (run-end    (dboard:min-max > (map (lambda (t)(+ (db:test-get-event_time t)(db:test-get-run_duration t))) testsdat)))
+			       (run-end    (let ((re (dboard:min-max > (map (lambda (t)(+ (db:test-get-event_time t)(db:test-get-run_duration t))) testsdat))))
+					     (max re (+ 1 run-start)))) ;; use run-start+1 if run-start == run-end so delta is not zero
 			       (timeoffset (- run-start)) ;; (+ fixed-originx canvas-margin) run-start))
 			       (run-duration (- run-end run-start))
 			       (timescale  (/ (- sizex (* 2 canvas-margin))
 					      (if (> run-duration 0)
 						  run-duration