Comment 6 for bug 198189

Confirmed here, on french locale:

2008/04/21 15:11:43 [Gettext] Loading language resource mlnet_strings.fr_FR.UTF-8
2008/04/21 15:11:43 [cO] loaded language resource file
2008/04/21 15:11:43 Decoding gui proto[41]: exception Failure("float_of_string"), opcode 53
ascii: [ 5(0)(1)(0) d(1)(0)(0) i(3)(0)(0)(2)(0)(4)(0) t o t o(4)(0) t u t u(186)(147) b(16)(196) % (245)(17)(213)(212) @(224) r(160) X(237) ,(25)(4)(0)(0)(0)(0)(236) ,(25)(4)(0)(0)(0)(0)(18)(0)(0)(0)(12)(0)(0)(0)(0)(7)(0) 1 0 1 0 1 0 0(1)(0)(0)(0)(0)(0)(0)(0)(4)(0) 2 . 2 0(1)(0)(2)(0)(0)(0)(3)(0)(0)(0)(0)(6)(0) t r a t r a(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)]
dec: [(53)(0)(1)(0)(100)(1)(0)(0)(105)(3)(0)(0)(2)(0)(4)(0)(116)(111)(116)(111)(4)(0)(116)(117)(116)(117)(186)(147)(98)(16)(196)(37)(32)(245)(17)(213)(212)(64)(224)(114)(160)(88)(237)(44)(25)(4)(0)(0)(0)(0)(236)(44)(25)(4)(0)(0)(0)(0)(18)(0)(0)(0)(12)(0)(0)(0)(0)(7)(0)(49)(48)(49)(48)(49)(48)(48)(1)(0)(0)(0)(0)(0)(0)(0)(4)(0)(50)(46)(50)(48)(1)(0)(2)(0)(0)(0)(3)(0)(0)(0)(0)(6)(0)(116)(114)(97)(116)(114)(97)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)]
00000000: 35 00 01 00 64 01 00 00 69 03 00 00 02 00 04 00 |5...d...i.......|
00000010: 74 6f 74 6f 04 00 74 75 74 75 ba 93 62 10 c4 25 |toto..tutu..b..%|
00000020: 20 f5 11 d5 d4 40 e0 72 a0 58 ed 2c 19 04 00 00 |.....@.r.X.,....|
00000030: 00 00 ec 2c 19 04 00 00 00 00 12 00 00 00 0c 00 |...,............|
00000040: 00 00 00 07 00 31 30 31 30 31 30 30 01 00 00 00 |.....1010100....|
00000050: 00 00 00 00 04 00 32 2e 32 30 01 00 02 00 00 00 |......2.20......|
00000060: 03 00 00 00 00 06 00 74 72 61 74 72 61 00 00 00 |.......tratra...|
00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000080: 00 00 00 |... |
Exception Failure("float_of_string") in check
Fatal error: exception Assert_failure("src/daemon/common/guiEncoding.ml", 1333, 4)

Workaround: mlgui doesn't crash if started with LANG=C