[help]the waterfall unable to show

zlib extend hass loaded in php, and the “Full Optimization Checklist” is normal. Can someone help me?

Do you see anything in your error logs? If you click on the blank waterfall, does a large version of the waterfall load or is it also blank? Usually you see that problem if gd isn’t installed but then the screen shot thumbnail wouldn’t have worked either.

Are you using the 2.6 WebPagetest release? PHP 5.3+?



Initializing WinPCap Complete
Waiting for startup synchronization
Requesting work from
Job of type ‘text/plain’ received
Work request response was empty

click the blank waterfall, it’s also blank
WebPagetest version is 2.5
Apache/2.2.11 (Win32)

gd info:
GD Support enabled
GD Version bundled (2.0.34 compatible)
FreeType Support enabled
FreeType Linkage with freetype
FreeType Version 2.1.9
T1Lib Support enabled
GIF Read Support enabled
GIF Create Support enabled
JPG Support enabled
PNG Support enabled
WBMP Support enabled
XBM Support enabled[hr]
waterfall.inc file of 322 lines of code are as follows:

for ($ms = $interval; $ms < $max_ms; $ms += $interval) {
$x = $x_scaler($ms);
imageline($im, $x, 1 + $row_height,
$x, $data_height - $row_height, $time_scale_color);

I tracking code and found $x is null, caused the code did’t continue to perform, as a result, $im is blank. but i can’t understand all of the code, so…