XTMax: every program using EMS crashes 4DOS

[pawosm-arm]

I've configured 4DOS for using EMS as a swap. It worked well with lotech's 2MB EMS card. Now as I've replaced it with XTMax, I'm observing something weird. When I'm returning to DOS (4DOS) from any program (game) using the EMS memory (e.g. Microweb, Wolf8086, Commander Keen 4), the system gets crashed with a message from 4DOS about the EMS corruption. I don't recall seeing it before...

4DOS unrecoverable error EM

Also the XTEMM driver is bigger than LTEMM. When I load it high into UMB, there's not much space left, and the 11kB packet driver for the network card does not fit into there anymore. So far I didn't observe any negatives from this, and even the RAM hungry games as Test Drive 3 still work, so it's a minor inconvenience with no practical significance. Maybe it's worth combining UMB and EMS driver into one and keep its parts in both RAM and UMB?

[pawosm-arm]

For a reference, the C:\CONFIG.SYS file:

DOS=UMB
DOSDATA=UMB
rem DEVICE=C:\UMB\USE!UMBS.SYS
DEVICE=C:\XTMAX\XTUMBS.SYS D000-E000
BUFFERS=20
FCBS=3,3
FILESHIGH=30
LASTDRIVEHIGH=D
STACKSHIGH=42,512
SET DOSDIR=C:\DOS
rem DEVICEHIGH=C:\PICOMEM\PMEMM.EXE /p:E000 /i:268
rem DEVICEHIGH=C:\LTEMM\LTEMM.EXE /p:E000 /i:260
DEVICEHIGH=C:\XTMAX\XTEMM.EXE /P:E000 /N
rem DEVICE=C:\SCATEMM\SCATEMM.SYS IOADDR=208
rem DEVICEHIGH=C:\XTMAX\XTSD.SYS
INSTALLHIGH=C:\AMSTRAD\MOUSE.COM
SHELLHIGH=C:\4DOS\4DOS.COM C:\4DOS\ /P

the C:\AUTOEXEC.BAT file:

@ECHO OFF
PATH C:\BAT;%DOSDIR%\BIN;C:\TOOLS
SET BLASTER=A220 I5 D1 T3
rem Following line commented out by 4DOS INSTALL
rem SET COMSPEC=C:\DOS\COMMAND.COM
SET TMP=C:\TMP
SET TEMP=%TMP%
SET LIB=C:\QUICKBAS
SET LANG=EN
SET MTCPCFG=%DOSDIR%\MTCP.CFG
SET WATTCP.CFG=%DOSDIR%
SET NLSPATH=%DOSDIR%\NLS
SET HELPPATH=%DOSDIR%\HELP
rem C:\PICOMEM\PMINIT.EXE
C:\UMB\TEST!UMB.EXE
rem LH C:\PICOMEM\FREESPT C
rem LH C:\PICOMEM\PM2000 0x60
LH C:\SMC8003\SMCPKT5\PKT8000 -i 0x60
LH C:\4DOS\KSTACK.COM
BORDER 5

the C:\4DOS\4DOS.INI file (using EMS is the default as long as a path to a swapfile is not specified):

[4DOS]
InstallPath = C:\4DOS\
UMBLoad=Yes
UMBHistory=Yes
UMBDirHistory=Yes
UMBEnvironment=Yes
UMBAlias=Yes
UMBFunction=Yes
Environment=384

EDIT: I've also tried a C:\CONFIG.SYS file prepared more like the README file advices it (XTEMM.EXE before XTUMBS.SYS), sadly, it does not improve anything (4DOS still crashes when I exit from Microweb and alike):

DOS=UMB
DOSDATA=UMB
rem DEVICE=C:\UMB\USE!UMBS.SYS
DEVICE=C:\XTMAX\XTEMM.EXE /P:E000
DEVICE=C:\XTMAX\XTUMBS.SYS D000-E000
BUFFERS=20
FCBS=3,3
FILESHIGH=30
LASTDRIVEHIGH=D
STACKSHIGH=42,512
SET DOSDIR=C:\DOS
rem DEVICEHIGH=C:\PICOMEM\PMEMM.EXE /p:E000 /i:268
rem DEVICEHIGH=C:\LTEMM\LTEMM.EXE /p:E000 /i:260
rem DEVICE=C:\SCATEMM\SCATEMM.SYS IOADDR=208
INSTALLHIGH=C:\AMSTRAD\MOUSE.COM
SHELLHIGH=C:\4DOS\4DOS.COM C:\4DOS\ /P

EDIT: loading EMS driver low before UMB .is. the only correct way of doing it. Microweb (see below) won't load pages otherwise.

[pawosm-arm]

Specifically, I don't think Microweb has it wrong and it works well with XTMax's EMS memory. Until I try to return to DOS.

[pawosm-arm]

Note: I've tried XTEMM.EXE /3 to force EMS 3.2 protocol support. It didn't help, 4DOS still crashes when exiting Wolf8086.