"<space>-d" was "tower". now it is "defencetower". fixed.
"i" was import transitional map format to convert from pre alpha23 map format to the recent one. fixed by removal. hope the rest of those shortcuts works ;)

the fix is in beta4-rc branch but no binaries so far. feel free to compile it. it will not cause incompatibilities with the official beta4 release. it is tagged beta4.2.

http://hg.globulation2.org/glob2-new/rev/ce773a35e1ae

Backtrace in beta4.1

glob2: libgag/include/StreamBackend.h:68: virtual void GAGCore::FileStreamBackend::read(void*, size_t): Assertion `fp' failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb679a910 (LWP 30526)]
0xb7f61430 in __kernel_vsyscall ()
(gdb) bt full
#0  0xb7f61430 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb7abb6d0 in raise () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2  0xb7abd098 in abort () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#3  0xb7ab45ce in __assert_fail () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#4  0x083160a6 in GAGCore::FileStreamBackend::read (this=0x8fdff48, data=0xb3eac0b0, size=16384) at libgag/include/StreamBackend.h:68
        _PRETTY_FUNCTION_ = "virtual void GAGCore::FileStreamBackend::read(void*, size_t)"
#5  0x083124d2 in GAGCore::BinaryInputStream::read (this=0x8fdff58, data=0xb3eac0b0, size=16384, name=0x836765e "undermap") at libgag/include/BinaryStream.h:79
No locals.
#6  0x0817b25d in Map::loadTransitional (this=0xbfd7563c) at src/Map.cpp:1227
        fileName = {static npos = 4294967295, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x8f9f8dc "maps/output"}}
        stream = (class GAGCore::InputStream *) 0x8fdff58
#7  0x0818f23b in MapEdit::handleKeyPressed (this=0xbfd74940, key={scancode = 31 '\037', sym = SDLK_i, mod = KMOD_NUM, unicode = 105}, pressed=true) at src/MapEdit.cpp:1745
        action_t = 0
#8  0x08196a8f in MapEdit::processEvent (this=0xbfd74940, event=@0xbfd747c4) at src/MapEdit.cpp:1730
        modState = KMOD_NUM
#9  0x08196bef in MapEdit::run (this=0xbfd74940) at src/MapEdit.cpp:1209
        event = {type = 2 '\002', active = {type = 2 '\002', gain = 0 '\0', state = 1 '\001'}, key = {type = 2 '\002', which = 0 '\0', state = 1 '\001', keysym = {scancode = 31 '\037', sym = SDLK_i, mod = KMOD_NUM, unicode = 105}},
  motion = {type = 2 '\002', which = 0 '\0', state = 1 '\001', x = 12831, y = 2317, xrel = 105, yrel = 0}, button = {type = 2 '\002', which = 0 '\0', button = 1 '\001', state = 0 '\0', x = 12831, y = 2317}, jaxis = {type = 2 '\002',
    which = 0 '\0', axis = 1 '\001', value = 12831}, jball = {type = 2 '\002', which = 0 '\0', ball = 1 '\001', xrel = 12831, yrel = 2317}, jhat = {type = 2 '\002', which = 0 '\0', hat = 1 '\001', value = 0 '\0'}, jbutton = {
    type = 2 '\002', which = 0 '\0', button = 1 '\001', state = 0 '\0'}, resize = {type = 2 '\002', w = 151859743, h = 105}, expose = {type = 2 '\002'}, quit = {type = 2 '\002'}, user = {type = 2 '\002', code = 151859743, data1 = 0x69,
    data2 = 0x1000}, syswm = {type = 2 '\002', msg = 0x90d321f}}
        isRunning = true
        returnCode = 0
        startTick = 8233
        endTick = 8213
        deltaTick = 13