Script runs fine in VU Generator but generates lots of errors when using Controller

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Dear all --

We are doing a performance testing for SAP applications.

On our test machine (DL380 Xeon 6 cores with 8GB being equally split into 2 VMs), we have:

SAPGUI 7.30
LoadRunner 11.51 with updated patches

We wrote 4-5 scripts simulating users doing MM (ME51, ME21, MIGO, etc), FI (F43, F51, etc), PM (IW31, IW32, etc).

There had been some troubles with SAP grids, enjoy screens -- but we managed to work around those using old interfaces.

All scripts run fine thru Replay/Run in VU Generator. Until we do it via the controller; we start to see errors like can't see so-and-so button.

We are really frustrated and couldn't find an answer or what to try out or any modification to make. Totally lost.

We tried fudging think_time 100, 150, 200% -- to no avail.
We tried one users, a few users -- didn't work; still hit errors.

Lost and desperate, we left out scripts aside and tried recording something really easy -- no editing, adding, modifying anything. Just plain browsing.

And [sigh] it still failed when run thru the controller -- even with one user. (of course, it runs fine using Replay/Run in VU Generator. All green. No error.)

Sample errors that we see..

Action.c(57): Error: Failed to find SapGui component by ID "sbar"
Action.c(57): Error: Failed to set property "Position" of SapGui component Scroll...
Action.c(190): Error: Failed to select active window "wnd[1]"
Action.c(57): Error: Failed to get the status bar text
Action.c(57): Error: Table - failed to set focus on "(0, 'Short Text')
Action.c(184): Error: Failed to press button "Release + Save"
...and more...

Here is the sample scripts to browse things in SAPGUI...

sapgui_set_ok_code("/nmb52",
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui1013",
END_OPTIONAL);

sapgui_send_vkey(ENTER,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui1014",
END_OPTIONAL);

lr_think_time(6);

sapgui_set_text("WERKS-LOW",
"CNT0",
ctxtWERKS1,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui1017",
END_OPTIONAL);

sapgui_set_focus(ctxtWERKS1,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui1018",
END_OPTIONAL);

sapgui_press_button("Execute (F8)",
btn1,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui1020",
END_OPTIONAL);

lr_think_time(8);

sapgui_set_ok_code("/nmmbe",
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui1023",
END_OPTIONAL);

sapgui_send_vkey(ENTER,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui1024",
END_OPTIONAL);

sapgui_select_active_session("ses[1]");

sapgui_select_active_window("wnd[0]");

sapgui_window_resize("145",
"26",
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui204",
END_OPTIONAL);

sapgui_set_text("MS_MATNR-LOW",
"3000003219",
ctxtMS_MATNR1,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui205",
END_OPTIONAL);

sapgui_press_button("Execute (F8)",
btn1,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui207",
END_OPTIONAL);

lr_think_time(5);

sapgui_set_text("IO_MATERIAL",
"3000009375",
ctxtIO_MATERIAL1,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui2010",
END_OPTIONAL);

sapgui_press_button("New Selection (Shift+F5)",
btn2,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui2011",
END_OPTIONAL);

lr_think_time(6);

sapgui_set_ok_code("/nmb51",
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui2014",
END_OPTIONAL);

sapgui_send_vkey(ENTER,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui2015",
END_OPTIONAL);

sapgui_select_active_session("ses[2]");

sapgui_select_active_window("wnd[0]");

sapgui_window_resize("145",
"26",
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui304",
END_OPTIONAL);

lr_think_time(4);

sapgui_set_focus(ctxtWERKS1,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui305",
END_OPTIONAL);

sapgui_press_button("Execute (F8)",
btn1,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui307",
END_OPTIONAL);

sapgui_press_button("Detail List (Ctrl+Shift+F12)",
btn3,
BEGIN_OPTIONAL,
"AdditionalInfo=sapgui3010",
END_OPTIONAL);

Any pointer is appreciated.